FollowTrajectoryAction: Standstillphase and initialDistanceOffset

Problem:

Trajectories can have a standstill phase if two following vertices have the same position but a different time specification. As a result, if the initialDistanceOffset makes the trajectory start at one of these vertices, it is not clear which time corresponds to that initialDistanceOffset.

Please clarify if a standstill phase should even be possible, and if so how to handle such cases where the initialDistanceOffset leads to time ambiguities.

Thanks in advance.